1
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
During water-gas shift reaction
A
water is evaporated in presence of catalyst.
B
carbon monoxide is oxidized to carbon dioxide.
C
carbon is oxidized to carbon monoxide.
D
carbon dioxide is reduced to carbon monoxide.
2
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
For a good quality cement, the ratio of silica to alumina is found to be :
A
1.5
B
2
C
3
D
4.5
3
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct group of halide ions which can be oxidised by oxygen in acidic medium is :

A
$$\mathrm{Br}^{-}$$ only
B
$$\mathrm{Cl}^{-}, \mathrm{Br}^{-}$$ and $$\mathrm{I}^{-}$$ only
C
$$\mathrm{Br}^{-}$$ and $$\mathrm{I}^{-}$$ only
D
$$\mathrm{I}^{-}$$ only
4
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The covalency and oxidation state respectively of boron in $$\left[\mathrm{BF}_{4}\right]^{-}$$, are :

A
3 and 4
B
4 and 3
C
4 and 4
D
3 and 5
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